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Why Is Snow White?

science.howstuffworks.com/nature/climate-weather/atmospheric/question524.htm

Why is snow white? It's frozen water, and water isn't white, it's clear. Learn why snow is white by examining the frequencies of light and how they're absorbed.

How Gears Work

science.howstuffworks.com/transport/engines-equipment/gear.htm

If a device has a motor, engine or spring, it probably has gears! But what do gears do, exactly, and how do they do it?

Why can't you tickle yourself?

science.howstuffworks.com/life/inside-the-mind/human-brain/question511.htm

Tickling yourself is a lot harder than it seems. Have you ever wondered why you cannot tickle yourself? Find out why self-tickling seems impossible.

How Terraforming Mars Will Work

science.howstuffworks.com/terraforming.htm

The thought of terraforming Mars is one of those ideas so outrageous that it just might work! Learn how it will work!

Why Does the Moon Look So Much Bigger When It Is Near the Horizon?

science.howstuffworks.com/question491.htm

Why does the moon look so much bigger when it is near the horizon than when it is high up in the sky?

What makes you dizzy when you spin?

science.howstuffworks.com/science-vs-myth/question483.htm

Dizziness happens when the part of your body that detects motion sends the wrong signals to your brain. Find out what causes dizziness when you spin.

How Much Coal Is Required to Run a 100-watt Light Bulb 24 hours a Day for a Year?

science.howstuffworks.com/environmental/energy/question481.htm

Where electricity is produced from a coal fired power station, how much coal is required to run a 100-watt light bulb 24 hours a day for one year?

How Fast Does a Bullet Travel?

science.howstuffworks.com/question456.htm

Reference frames can help explain how a bullet fired from a gun behaves on a moving train. Learn more about reference frames and Newton's first law.

Where does the color come from in purple cabbage?

science.howstuffworks.com/life/botany/question439.htm

Nature uses color in lots of different ways. Find out why some types of cabbage are purple and what this means.

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